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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement of Stockholders' Equity [Abstract]        
Cash dividends per common share $ 0.14 $ 0.12 $ 0.26 $ 0.24